The invention discloses a support device for welding of a circuit board. The support device comprises a bottom plate and a back panel, wherein the back panel is fixedly connected with one end of the bottom plate, a pair of support plates are arranged in parallel on the bottom plate, bracket plates are arranged below sides, opposite to each other, of the two support plates, a hydraulic lifting mechanism is arranged at a position, near to the back panel, of the bottom plate, the hydraulic lifting mechanism comprises a hydraulic cylinder, a connection fork and a press plate, a piston of the hydraulic cylinder is connected with a middle part of the connection fork, the connection fork is of a Y-shaped structure, two forks of the connection fork are connected with the press plate, the shape ofthe press plate is adaptive to the shapes of the bracket plates, rubber soft cushions are arranged at contact positions of the press plate and the bracket plates, and a control switch is arranged on the bottom plate and is used for controlling the hydraulic cylinder to ascend and descend. The support device is simple in structure and is convenient to operate, and the protection measure on an edgefixing part of the circuit board is improved.